1. A speed boat requires 65 kW to move at a constant speed of 9 m/s. What is the

Question

1. A speed boat requires 65 kW to move at a constant speed of 9 m/s. What is the resistive force of the water at this speed? A) 7222N B) 1755 N C) 585 N D) 9750N E) 6500 N 2. A tractor is speeding up at 1.2 m/s a 1700 kg sled with a rope at an angle of 32°. The coefficient of kinetic friction between the sled and ground is 0.65. What is the tension in the rope? A) 16320 N B) 10790 N C) 3315N D) 8370N E) 4420N 3. Two ropes are attached to a 40 kg object. The rope with a 50 N force points along a direction 28 from the positive x- axis, and the other robe with a 90 N force points along a direction 210P. What is the acceleration of the object? A) 50.4 m/s B) 13.6 m/s C) 12 m/s D) 14.112 m/s E) 5.88 m/s friction and air resistance, how fast will the roller coaster be moving at the top of a subsequent hill, which is 15 m? A) 65.2 m/s B) 71.55 m/s C) 6.75 m's D) 18.9 m/s E) 53 m/s

Explanation / Answer

Given:

P = 65kW

=65*10^3

v = 9m/s

We know, P = Fv

F = P/v

= 65*10^3/9

= 7222 N

Hence (A) is correct option.

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